Pluralize & Singularize Words
Real English pluralisation rules — sibilants, consonant‑y, ‑f/‑fe, ‑o exceptions, unchanging words, irregulars and Latin/Greek forms — with a count-aware “1 item / 2 items” mode.
A leading number is read as a count: 1 item stays singular and 2 item becomes 2 items, whichever direction is selected.
mouse child analysis box city leaf photo data 1 item 2 items sheep
Rule matched for each word
| # | Input | Output | Rule applied |
|---|---|---|---|
| 1 | mouse child analysis box city leaf photo datum | mouse child analysis box city leaf photo data | ‑um → ‑a (datum → data) |
| 2 | 1 item | 1 item | count 1 → singular; no rule matched — left unchanged |
| 3 | 2 item | 2 items | count 2 → plural; default: add ‑s |
| 4 | sheep | sheep | unchanging word (sheep, series, aircraft) |
About this tool
Pluralisation runs an ordered rule set rather than appending an “s”: sibilant endings take ‑es, consonant + y becomes ‑ies, ‑f/‑fe becomes ‑ves, and ‑o is split into the words that take ‑es (potato, hero) and those that take ‑s (photo, piano). Unchanging words, true irregulars and the Latin/Greek forms are looked up in explicit tables, and the reverse direction applies the mirror rules — with a prefix table so that data → datum and media → medium work. Every answer reports the rule that produced it. Count-aware mode reads a leading number and picks the singular for exactly 1. Everything runs locally in your browser.
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Pluralize & Singularize Words really free?
Yes. Pluralize & Singularize Words is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Pluralize & Singularize Words upload my data?
No. Pluralize & Singularize Words runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Pluralize & Singularize Words is ready to use on desktop or mobile.
Does Pluralize & Singularize Words work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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